Money Diary: Market Researcher On £27k

Welcome to Money Diaries, where we're tackling what might be the last taboo facing modern working women: money. We're asking a cross-section of women how they spend their hard-earned money during a seven-day period – and we're tracking every last penny.
This week we're with a Commercial Executive working in Market Research from London. She makes £27k and is currently trying to live off £20 a day, including travel, in order to save up money for a holiday in a few months’ time. But, in the city with the most expensive public transport in the world, this isn't always as easy as it sounds....
Industry: Market Research
Age: 25
Location: London
Salary: £27k
Paycheque amount per month: £1,700
Number of housemates: 3
Monthly Expenses
Housing Costs : £700 rent
Loan Payments: Only my student loan that comes out at the source. I pay my credit card off everyone month so there aren't any charges for that
Utilities: Water, gas and electric paid quarterly, but probably about £50 per month. Internet, £4.25, TV license: £3.03, council tax: £27.75
Travel: Depends - I pay as I go
Phone Bill: £35
Savings? £150, which is definitely NOT to be touched.
Other? £8 to Save the Children, £30 gym membership, £9.99 Apple Music
Total: £968.02